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Power source multiplexer

  • US 8,981,839 B2
  • Filed: 06/11/2013
  • Issued: 03/17/2015
  • Est. Priority Date: 06/11/2012
  • Status: Active Grant
First Claim
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1. Circuitry comprising:

  • a first switching transistor element having a first gate;

    a second switching transistor element having a second gate;

    a third switching transistor element having a third gate; and

    a fourth switching transistor element having a fourth gate, wherein;

    the first switching transistor element and the third switching transistor element are coupled in series between a first power source and a first downstream circuit;

    the second switching transistor element and the fourth switching transistor element are coupled in series between a second power source and the first downstream circuit;

    when a first gate signal is presented to the first gate, a voltage swing at the first gate is about equal to a first voltage magnitude;

    when a second gate signal is presented to the second gate, a voltage swing at the second gate is about equal to the first voltage magnitude;

    when a third gate signal is presented to the third gate, a voltage swing at the third gate is about equal to a second voltage magnitude;

    when a fourth gate signal is presented to the fourth gate, a voltage swing at the fourth gate is about equal to the second voltage magnitude;

    the first power source is adapted to provide a first output voltage having the first voltage magnitude; and

    the second power source is adapted to provide a second output voltage having the second voltage magnitude;

    wherein the first voltage magnitude is not equal to the second voltage magnitude.

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